test_fork.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>

int main(void)
{
	int x,status;
  int *arr1 = calloc(500000000, 1);
	x = fork();
	if(x>0){
		wait(&status);
  } else {
    for (size_t i = 0; i < 500000000; i += 4096) {
      arr1[i] ++;
      for (size_t j = 0; j < 100000; j ++) {
        sched_yield();
      }
    }
		exit(0);
	}
  return 0;
}